package com.tudouji.common.utils.file;

import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.math.BigDecimal;

import lombok.extern.slf4j.Slf4j;
import net.coobird.thumbnailator.Thumbnails;
import org.apache.commons.io.FilenameUtils;
import org.springframework.mock.web.MockMultipartFile;
import org.springframework.web.multipart.MultipartFile;
import com.tudouji.common.constant.Constants;
import com.tudouji.common.exception.file.FileNameLengthLimitExceededException;
import com.tudouji.common.exception.file.FileSizeLimitExceededException;
import com.tudouji.common.exception.file.InvalidExtensionException;
import com.tudouji.common.utils.DateUtils;
import com.tudouji.common.utils.IdUtils;
import com.tudouji.common.utils.StringUtils;
import com.tudouji.framework.config.TuDouJiConfig;

import javax.imageio.ImageIO;

/**
 * 文件上传工具类
 *
 * @author ruoyi
 */
@Slf4j
public class FileUploadUtils {
    /**
     * 默认大小 50M
     */
    public static final long DEFAULT_MAX_SIZE = 50 * 1024 * 1024;

    /**
     * 默认的文件名最大长度 100
     */
    public static final int DEFAULT_FILE_NAME_LENGTH = 100;

    /**
     * 默认上传的地址
     */
    private static String defaultBaseDir = TuDouJiConfig.getProfile();

    public static void setDefaultBaseDir(String defaultBaseDir) {
        FileUploadUtils.defaultBaseDir = defaultBaseDir;
    }

    public static String getDefaultBaseDir() {
        return defaultBaseDir;
    }

    /**
     * 以默认配置进行文件上传
     *
     * @param file 上传的文件
     * @return 文件名称
     * @throws Exception
     */
    public static final String upload(MultipartFile file) throws IOException {
        try {
            return upload(getDefaultBaseDir(), file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 根据文件路径上传
     *
     * @param baseDir 相对应用的基目录
     * @param file    上传的文件
     * @return 文件名称
     * @throws IOException
     */
    public static final String upload(String baseDir, MultipartFile file) throws IOException {
        try {
            return upload(baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 文件上传
     *
     * @param baseDir   相对应用的基目录
     * @param file      上传的文件
     * @param extension 上传文件类型
     * @return 返回上传成功的文件名
     * @throws FileSizeLimitExceededException       如果超出最大大小
     * @throws FileNameLengthLimitExceededException 文件名太长
     * @throws IOException                          比如读写文件出错时
     * @throws InvalidExtensionException            文件校验异常
     */
    public static final String upload(String baseDir, MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, IOException, FileNameLengthLimitExceededException,
            InvalidExtensionException {
        int fileNamelength = file.getOriginalFilename().length();
        if (fileNamelength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH) {
            throw new FileNameLengthLimitExceededException(FileUploadUtils.DEFAULT_FILE_NAME_LENGTH);
        }

        assertAllowed(file, allowedExtension);

        String fileName = extractFilename(file);
        File desc = getAbsoluteFile(baseDir, fileName);
        String pathFileName = getPathFileName(baseDir, fileName);
        if (FileUtils.isValidImgname(file.getOriginalFilename())) {
            file = zipImg(file);
            file.transferTo(desc);
            ImgCompress compress = new ImgCompress(desc, baseDir + "/" + "/" + fileName.substring(0, fileName.lastIndexOf("."))
                    + "-suolue" + fileName.substring(fileName.lastIndexOf("."), fileName.length()));
            compress.resize(85, 85);
        }
        return pathFileName;
    }

    /**
     * 压缩图片，不修改尺寸
     * 1、接收 file 源文件，并判断是否为空
     * 2、不修改原尺寸，按比例压缩图片
     * 3、将压缩后的图片封装为 MultipartFile 类型返回
     * @param file
     * @return
     */
    public static MultipartFile zipImg(MultipartFile file) {
        // 判空，并且大于1024kb再压缩

        if(file == null || file.getSize() <= 400 * 1024) {
            return file;
        }
        // 根据输入流压缩
        log.info("压缩前图片大小===》{}",file.getSize());
        BigDecimal fileSize = BigDecimal.valueOf(file.getSize());
        BigDecimal val = BigDecimal.valueOf(200 * 1024);
        BigDecimal outputQuality = val.divide(fileSize, 3, BigDecimal.ROUND_HALF_UP);
        log.info("outputQuality===》{}",outputQuality.floatValue());
        // 字节文件输出流，保存转换后的图片数据流
        ByteArrayOutputStream outputStream = null;
        // 通过输入流转换为 MultipartFile
        ByteArrayInputStream inputStream = null;
        try {
            outputStream = new ByteArrayOutputStream();
            Thumbnails.of(file.getInputStream())
                    .scale(1f) //按比例放大缩小 和size() 必须使用一个 不然会报错
                    .outputQuality(outputQuality.floatValue()) //输出的图片质量  0~1 之间,否则报错
                    .toOutputStream(outputStream); //图片输出位置
            // 将 outputStream 转换为 MultipartFile
            byte[] bytes = outputStream.toByteArray();
            inputStream = new ByteArrayInputStream(bytes);
            // 创建 MockMultipartFile 对象，该类在【spring-test】依赖中
            MockMultipartFile outFile = new MockMultipartFile(file.getOriginalFilename(), file.getOriginalFilename(), file.getContentType(), inputStream);
            log.info("压缩后图片大小===》{}",outFile.getSize());
            // 返回图片
            return outFile;
        } catch (IOException e) {
            log.error("图片压缩失败===》{}",e);
            throw new RuntimeException(e);
        }finally {
            // 关闭流
            try {
                outputStream.close();
                inputStream.close();
            } catch (IOException e) {
            }
        }
    }

    /**
     * 编码文件名
     */
    public static final String extractFilename(MultipartFile file) {
        String fileName = file.getOriginalFilename();
        String extension = getExtension(file);
        fileName = DateUtils.datePath() + "/" + IdUtils.fastUUID() + "." + extension;
        return fileName;
    }

    private static final File getAbsoluteFile(String uploadDir, String fileName) throws IOException {
        if (FileUtils.isValidImgname(FilenameUtils.getExtension(fileName))) {

        }
        File desc = new File(uploadDir + File.separator + fileName);

        if (!desc.getParentFile().exists()) {
            desc.getParentFile().mkdirs();
        }
        if (!desc.exists()) {
            desc.createNewFile();
        }
        return desc;
    }

    private static final String getPathFileName(String uploadDir, String fileName) throws IOException {
        int dirLastIndex = TuDouJiConfig.getProfile().length() + 1;
        String currentDir = StringUtils.substring(uploadDir, dirLastIndex);
        String pathFileName = Constants.RESOURCE_PREFIX + "/" + currentDir + "/" + fileName;
        return pathFileName;
    }

    /**
     * 文件大小校验
     *
     * @param file 上传的文件
     * @return
     * @throws FileSizeLimitExceededException 如果超出最大大小
     * @throws InvalidExtensionException
     */
    public static final void assertAllowed(MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, InvalidExtensionException {
        long size = file.getSize();
        if (DEFAULT_MAX_SIZE != -1 && size > DEFAULT_MAX_SIZE) {
            throw new FileSizeLimitExceededException(DEFAULT_MAX_SIZE / 1024 / 1024);
        }

        String fileName = file.getOriginalFilename();
        String extension = getExtension(file);
        if (allowedExtension != null && !isAllowedExtension(extension, allowedExtension)) {
            if (allowedExtension == MimeTypeUtils.IMAGE_EXTENSION) {
                throw new InvalidExtensionException.InvalidImageExtensionException(allowedExtension, extension,
                        fileName);
            } else if (allowedExtension == MimeTypeUtils.FLASH_EXTENSION) {
                throw new InvalidExtensionException.InvalidFlashExtensionException(allowedExtension, extension,
                        fileName);
            } else if (allowedExtension == MimeTypeUtils.MEDIA_EXTENSION) {
                throw new InvalidExtensionException.InvalidMediaExtensionException(allowedExtension, extension,
                        fileName);
            } else {
                throw new InvalidExtensionException(allowedExtension, extension, fileName);
            }
        }

    }

    /**
     * 判断MIME类型是否是允许的MIME类型
     *
     * @param extension
     * @param allowedExtension
     * @return
     */
    public static final boolean isAllowedExtension(String extension, String[] allowedExtension) {
        for (String str : allowedExtension) {
            if (str.equalsIgnoreCase(extension)) {
                return true;
            }
        }
        return false;
    }

    /**
     * 获取文件名的后缀
     *
     * @param file 表单文件
     * @return 后缀名
     */
    public static final String getExtension(MultipartFile file) {
        String extension = FilenameUtils.getExtension(file.getOriginalFilename());
        if (StringUtils.isEmpty(extension)) {
            extension = MimeTypeUtils.getExtension(file.getContentType());
        }
        return extension;
    }
}